AMERICAN PHILOSOPHICAL SOCIETY / SCIENCE PHOTO LIBRARY AMERICAN PHILOSOPHICAL SOCIETY / SCIENCE PHOTO LIBRARY
Chimpanzee problem solving research. Chimpanzee assembling sticks to reach bananas placed out of its reach outside of its cage. This work by the German psychologist Wolfgang Kohler (1887-1967) at a primate research station on Tenerife, led to the book 'Mentality of the Apes' (1917).
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